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Crates.io vs US Autocomplete

Same instrument, two spec sheets — measured, not claimed.

APICrates.ioHEALTHY90US AutocompleteREACHABLE99
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d100%98.3%
P50 · ms458683
P95 · ms13171917
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crates.io vs US Autocomplete: common questions

Which is more reliable, Crates.io or US Autocomplete?

Both are neck-and-neck — Crates.io and US Autocomplete each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Crates.io or US Autocomplete?

Crates.io has the lower median latency in our checks — Crates.io responds in 458 ms versus US Autocomplete at 683 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Crates.io and US Autocomplete need an API key?

Crates.io needs no key, while US Autocomplete requires a free API key. If you want to start calling without signup, reach for Crates.io first.

Can I call Crates.io and US Autocomplete from the browser?

Yes — both Crates.io and US Autocomplete send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Crates.io and US Autocomplete free for commercial use?

Crates.io has unclear commercial terms, and US Autocomplete has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.